| abstract |
BASFAKTIENGESELLSCHAFT O.Z. 0050/42811 Aqueous Polyurethane Dispersion Abstract of the disclosure: An aqueous dispersion containing a polyurethane and from 5 to 60wt%, based on the polyurethane, of a polymeric adhesion enhancer, the polyurethane being essentially built up of (a) an organic polyisocyanate, (b) a dihydroxyl compound having a molecular weight exceeding 500 and ranging up to 5000g/mol and not containing any anionic groups or groups capable of conversion to anionic groups, (c) a di- or mono-hydroxyl compound containing carboxylic acid groups or carboxylate groups, (d) optionally a further compound different from (c) and containing one or two isocyanate-reactive functional groups and at least one anionic group or a group capable of conversion to an anionic group, (e) optionally a compound different from (c) and (d) and having two isocyanate-reactive functional groups and a molecular weight of from 60 to 500 g/mol, and the polyurethane or its prepolymer is prepared in a water-miscible solvent boiling below 100°C and, following the addition of the polymeric adhesionenhancer, is dispersed in water and, in the case of the prepolymer, the conversion of the latter to the polyurethane is carried out. |